Download [PDF] April 2019 CAIE P2 Mark Schemes 1113 Science Cambridge Lower Secondary Checkpoint

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[PDF] April 2019 CAIE P2 Mark Schemes 1113 Science Cambridge Lower Secondary Checkpoint.pdf | Plain Text

This document consists of 14 printed pages. IB19 05_1113_02/3RP © UCLES 2019 [Turn over Cambridge Assessment International Education Cambridge Secondary 1 Checkpoint SCIENCE 1113/02 Paper 2 April 2019 MARK SCHEME Maximum Mark: 50 Published This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Markers were instructed to award marks. It does not indicate the details of the discussions that took place at an Markers’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the End of Series Report. Cambridge will not enter into discussions about these mark schemes.

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 2 of 14 Annotations and abbreviations / OR alternate responses for the same marking point ( ) the words or units in brackets do not need to be stated Accept an acceptable response Do not accept indicates an incorrect response that would contradict another otherwise correct alternative Ignore indicates an irrelevant answer that is not creditworthy, however, full marks can still be achieved even with the answers that are ignored ecf error carried forward, marks are awarded if an incorrect response has been carried forward from earlier working, provided the subsequent working is correct ora or reverse argument note provides extra information when necessary

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 3 of 14 Question Answer Marks Further Information 1(a) any three from respiration reproduction growth nutrition excretion movement / can move sensitivity / irritability 1 three correct = 1 mark 1(b)(i) (many) more yeast (cells) / more cells 1 Accept cells multiplied / yeast increases / multiply themselves 1(b)(ii) cells had divided / reproduced 1

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 4 of 14 Question Answer Marks Further Information 2(a) Forces between the particles are weak.  The particles are only able to vibrate. The particles form a fixed shape. The particles have very little energy. 1more than one tick = 0 marks 2(b) absorption diffusion dissolving mixing 1more than one answer circled = 0 marks 2(c) any two from (idea that) particles will have more energy particles move faster particles collide more particles spread out more 2note the answer must refer to particles at least once to get maximum marks note assume answer refers to hot food if not specified. Accept ora if specified Accept particles have more kinetic energy = 2 marks Accept spread out faster / particles diffuse faster

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 5 of 14 Question Answer Marks Further Information 3 mirror normal angle of incidence angle of relection incident ray reflected ray 3five correct = 3 marks three or four correct = 2 marks one or two correct = 1 mark

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 6 of 14 Question Answer Marks Further Information 4(a) A B C D E 1more than one answer circled = 0 marks 4(b) pollen lands on stigma 1Accept pollen transferred from one flower to another / pollen goes from anther to stigma Accept pollen lands on A Accept ‘male gamete’ for ‘pollen’ 4(c) A B C D E 1more than one answer circled = 0 marks 4(d) (nucleus of) pollen and (nucleus of) ovule fuse 1Accept ‘female gamete’ or ‘egg’ for ‘ovule’ Accept ‘male sex cell’ for ‘pollen’ and ‘female sex cell’ for ‘ovule’ Accept male gamete for pollen Accept gametes fuse / gametes join together / gametes combine Accept pollen or male gamete and ovule form a zygote

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 7 of 14 Question Answer Marks Further Information 5(a) (electronic) balance 1Accept scale(s) / beam balance / triple beam balance Do not accept weighing balance or weighing scales 5(b) D 1 5(c) Hazard: hot dish / burn hand / the oven is hot. To avoid the hazard Rajiv should use tongs / heat resistant gloves / let the dish cool before picking it up. OR Hazard: getting soil in eyes. To avoid the hazard Rajiv should wear goggles / safety glasses. 2 note hazard = 1 mark how to avoid the hazard = 1 mark note two marks can only be awarded by a hazard and a linked precaution Accept Hazard idea of heat damage to clothes. To avoid the hazard Rajiv should wear lab coat. OR Hazard bacteria from soil / insects in soil / infection from soil / toxic (minerals in) soil. To avoid the hazard Rajiv should wear goggles / safety glasses / gloves.

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 8 of 14 Question Answer Marks Further Information 6 green red blue yellow magenta cyan white 2note only accept these colours four correct = 2 marks two or three correct = 1 mark one correct = 0 marks Question Answer Marks Further Information 7 When metals react with acid the products are a salt and hydrogen . When carbonates react with acid the products are a salt, water and carbon dioxide . 3each missing substance = 1 mark water and carbon dioxide in either order

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 9 of 14 Question Answer Marks Further Information 8(a) to obtain reliable results 1Accept to work out an average 8(b) any one from birds are (too) mobile / immigration / migration / fly away (rapid) birth / death out at different times of day impossible to count them all / too many / over too large an area idea of difficult to be sure that you have not counted same bird twice or some not at all 1 Accept cannot find them as they are in different places / not all birds seen

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 10 of 14 Question Answer Marks Further Information 8(c) any two from habitat (destruction) food (supply) / damage to food chains / amount of prey predation / hunters competition pest control (trapping / shooting / use of poisons) climate (change) disease time of year / season pollution 2 Accept competition for a named factor e.g. nesting sites or shelter Accept reproduction (rate) / birth rate / death rate Question Answer Marks Further Information 9(a) The nucleus of the atom contains protons and neutrons . The nucleus is surrounded by particles called electrons . 3either order each correct answer = 1 mark 9(b)(i) H1 9(b)(ii) Na1

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 11 of 14 Question Answer Marks Further Information 10(a) the transfer of energy 1Accept energy transfer / energy flow 10(b) mouse, rabbit and grasshopper 1all three required 10(c) the hawk feeds at more than one trophic level / can be a tertiary consumer 1Accept it eats (both primary and) secondary consumers 10(d) hawk 1 10(e) any one from go up – more grass to eat / less competition (by rabbits) for food go down – lack of rabbits means hawks will need to eat more mice stay the same – idea that more grass to eat AND more predation by hawks will even out 1mark the change and the linked reason

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 12 of 14 Question Answer Marks Further Information 11(a) any two from sun / solar wind / (a)eolic wave geothermal biofuel / biomass tidal 1two correct = 1 mark Do not accept nuclear Accept wood 11(b) any three from (%) of coal decrease (%) of oil decrease (%) of natural gas decrease (%) of (other) renewables increase / example of renewable increasing e.g. tidal increases (%) of hydroelectric increase 3Accept (%) of fossil fuels or non-renewables will decrease if no marks awarded for coal, oil or natural gas Accept (%) of nuclear (may) increase / (%) of nuclear (may) decrease

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 13 of 14 Question Answer Marks Further Information 12(a) The name of this electrical component is a cell . The electrical circuit symbol for this component is or Name of this electrical component is a battery . The electrical circuit symbol for this component is 2correct component = 1 mark correct symbol = 1 mark 12(b) In circuit A the lamps do not work . This is because there is no current / a gap in the circuit / it is a series circuit / electrons cannot flow / the circuit does not transfer electrical energy. In circuit B the lamps work . This is because there is current to each lamp / current divides / the lamps are still in a complete circuit / it is a parallel circuit / electrons can flow / the circuit still transfers electrical energy. 2correct two answers for A = 1 mark correct two answers for B = 1 mark

1113/02 Checkpoint Secondary 1 Science – Mark Scheme April 2019 PUBLISHED Page 14 of 14 Question Answer Marks Guidance 14 pencil has large(r) area so less pressure / so low pressure 2note assume answers refer to pencil Accept ora if pin specified Accept pressure is force / area as an equation or in words = 2 marks Question Answer Marks Guidance 13(a) hydrogen 1 13(b) calcium carbonate calcium chloride calcium hydrate calcium hydroxide calcium oxide 1more than one circled = 0 marks 13(c) (idea that) too reactive / not safe / may burst into flames 1